Doping properties of Sb2Te3 indicating a two valence band model

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Abstract

Seebeck coefficient and electrical conductivity has been measured on Sb2Te3 doped with Pb, I, CuBr2, Sn etc. The material is always strongly p-type with S ≅ 80 μV⧸°K and σ varying between 2.105 and 5.105(Ωμ)−1. The S versus σ curve indicates two valence bands with parameters μ0(mm)32 = 0.0057 m2/Vs and 0.034 m2Vs separated by 0.23 eV. The doping behaviour i discussed in terms of the crystal bonding.

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On leave from Dep. de Fisica, Universidad Técnica del Estado, Santiago, Chile.

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